What the hell is going on? Nishi was always an asshole and a douchebag, but his attempt on Tae's life and his subsequent reaction to her supposed death turned him into a psychopath. Izumi was the psychopath, not Nishi.
And then he's trying to be buddy-buddy("hey, man, don't worry, we can bring her back anyway") with Kurono, and Kurono almost listens to him, even after supposedly killing his girl.
This arc is all over the place.